So if these realms were melded who would win if the races united and fought the other universe in your opinions. What would the tactics plans army make up look like for these two sides. And describe or discuss everything that'd take place and some important battles and tech for these two as well.

I think vs threads might be forbiden on the forum , and even if they weren't this is pretty bad thread anyway

Lord of the Rings.

Both universes have trump cards which are exclusive to their mythos. So I don't think this question can be properly answered.

As much as I love TES, even thinking about the Elder Scrolls universe being melded with Middle-Earth is an insult to Tolkien's work.

Tolkien is known as the father of conventional Fantasy Fiction.
It is hard to deny his influence on the Elder Scrolls, and many other works.
Comparing them would be like comparing me to my dad. Or anyone to their parent.

ES and LOTR have similarities and differences, and I don't really see the point in comparing them.
Personally I prefer Elder Scrolls, much in part to Ted Peterson and Micheal Kirkbride's work on the lore and design.
Mainly because they brought ES away from being a generic Tolkien Clone(like a lot of DnD campaign settings, Dragon Age and The Witcher) and into it's own thing.

LOTR to TES: "I AM YOUR FATHER!"

Ents vs Hist, that should be tough

Could the Ents invade Black Marsh successfully?

I don't know doubt it to many were burned XD

I'm not sure if it is I wouldn't think so but thanks for the input

Maybe "uncle." I think that TES inherits more traits from Leiber's Gray Mouser stories than from LOTR.